#include<stdio.h>
#include<unistd.h>

int main()
{
    pid_t  p1,p2;
    while((p1 == fork()) == -1);
    if(p1 == 0) 
        putchar('x');
    else 
    {
       while((p2 == fork()) == -1);
       if(p2 == 0) putchar('c');
       else  putchar('a');
    }
    return 0;
}
